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Pequeñas partículas dominan el anillo de Phoebe de Saturno a distancias sorprendentemente grandes
Douglas P Hamilton1, Michael F Skrutskie2, Anne J Verbiscer2
1Department of Astronomy, University of Maryland, College Park, Maryland 20742-2421, USA.
Nature
|June 12, 2015
Resumen
El anillo más externo de Phoebe de Saturno se extiende mucho más lejos de lo que se conocía anteriormente, de 100 a 270 radios de Saturno. El análisis sugiere distribuciones de tamaño de partícula pronunciadas y partículas más grandes dominan este sistema de anillos débil y antiguo.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- La astronomía es la astronomía.
- Sistemas de anillos Sistemas de anillos.
Sus antecedentes:
- El anillo más externo de Saturno, descubierto en 2009, tiene su origen en la luna Phoebe.
- La extensión radial completa del anillo y el tamaño de las partículas eran previamente indeterminados.
- Es significativamente más grande que el anillo E de Saturno.
Objetivo del estudio:
- Para determinar la extensión radial completa del anillo de Phoebe de Saturno.
- Para restringir la distribución del tamaño de partícula dentro del anillo.
- Para entender la formación y evolución del anillo.
Principales métodos:
- Imágenes infrarrojas para mapear todo el anillo.
- Modelado de la dinámica orbital de las partículas de anillo expulsadas de Phoebe.
- Construcción de perfiles teóricos de leyes de potencia para la distribución del tamaño de las partículas.
Principales resultados:
- El anillo de Febe se extiende desde 100 hasta 270 radios de Saturno.
- Los perfiles de distribución del tamaño de partícula más pronunciados se ajustan mejor a los datos de observación.
- Es probable que las temperaturas elevadas de los granos contribuyan a la pendiente observada.
Conclusiones:
- El anillo de Phoebe de Saturno es una vasta estructura con una fuerte distribución del tamaño de las partículas.
- Las partículas más grandes (radios > 10 cm) contribuyen significativamente al área de la sección transversal del anillo.
- Estas partículas más grandes tienen órbitas estables, lo que indica su persistencia a largo plazo.
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